Adjustable hand-drill



March 27, 1951 s. sHALER ADJUSTABLE HANDDRILL Filed Aug.y e, 1947 2Sheets-Sheet l BY l u HTTOPNEY March 27, 1951 s. SHALER 2,546,655

ADJUSTABLE HAND-DRILL Filed Aug. 6, 1947 2 Sheets-Sheet 2 INVENTOR.

S/QUL SHFLE/Q BY @M-JW@ Patented Mar. 27, 1951 UNITED STATES ATENTOFFICE 2 Claims.

Movide e and eee* nomical to manufacture, its operation and not apt toget out or order.

The tool of this invention embodies, fundamentally, two members orplates adapted to be placed in face abutting relation and clampedtogether' by a stud holt. contacting of these plates are complemcntarilyradially corrugated or serrated to interiit with one another and helocked together against relative rotation when the stud holt istightened. On one of these plates, the chuck spindle is mounted torotate on an axis extending radially of said. stud colt and chuckspindle carries a pinion which meshes with a driving gear rotatable onthe stud bolt. The handle oi the drill is to a shank rigid with otherplate. When 'the stud holt is loosened,

.the plates be adjusted to shirt the chuck,

spindle into desired angular relation to the handle of the tool and, iithe holt is then tightened, the parts will remain in t1 ese relativepositions, while permitting the drive of the tool through a gear andpinion in the usual nia-nner.

Features oi the invention, other than those specified, will be apparentfrom the hereinafter detailed description and claims, when read inconjunction with the accompanying drawing.

rilhe accompanying drawing illustrates one practical embodiment of theinvern but the construction therein shown is to he understood asillustrative, oni, and not as dening the limits oi the invention.

Figure l is a front elevation of a drill embodying the presentinvention, with certain parts broken away in the interests oi clearness.

Figure 2 is a central section on the line i-2 ol'- Figure l.

Figures 3 and 4 are face views of the contacting laces oi the twoplates, which permit the lockn ing of the plates in the angularadjustment referred to.

Figure 5 is a view similar to Figure 2, but showing a modified form oithe invention with the parts separated or spaced with respect to onearrother, so that the individual structures are clearly apparent.

Figure 6 shows a further modified detail of the invention.

Figures 7 and 8 correspond to Figures 3 and e, but show the structureillustrated in Figure 5.

Referring to the form of the invention shown in Figures 1 4 of thedrawings, l and 2 designate two plates oi any desired shape andconguration. They are provided with aiined periorations,

3 to receive a stud holt i whereby they may be secured together in facecontacting relation. The contiguous faces of these two plates areooinplementarily radially serrated, as indicated at 5, and theseserrations on the two plates are adapted to interlt with one another, sothat when the bolt is tightened to clamp them together, the plates arelooked against angular movement about t .e axis of said holt. Theserrations on one of these plates may Toe conveniently formed on a hossto he received into a correspondingly formed depression in the face ofthe other plate.

The stud holt fi is shown as shouldered at Ei and the two plates areclamped to one another between this shoulder and a wing tout l', asshown best in Figure 2. Beyond the shoulder 6, the stud bolt has anenlarged cylindrical hearing il for a driving gear 9 carrying an oiisetoperating knob lll. The plate i is radially bored to form a cylindricalhearing i i, normal to the axis of bolt Il, for the inboard end oi thechuck spindle i2 and this spin le is held in this hearing hy a pin i3driven through the plate and into an ,ular groove ifi formed in thespindle (see Fig re 2). The spindle i2 also carries a pinion l 5, igidwith and keyed to the spindle and meshing with the d iving gear e andthe outboard end of the spindle carries the usual chuck it.

The other plate '2 has a shank il, also radial of the holt l, and thisshank is fitted into an appropriete handle ill. by which the tool isheld While the knob l@ is rotated to drive the chuck spindle and operatethe tool carried thereby.

'Under normal conditions, the chuck spindie will he in alineinent withthe handle shank il, as shown in full lines in Figure l. of the drawing,out if it is desired to change this relation, the Wing nut l may heloosened, so as to permit the plate i to he swung around to 1oring thechuck spindle into, for example, the dotted line position ci Figure l,whereupon the tightening of the wing 'out 'l will clamp the plates tther, so to maintain this relation and permit of the operation of thetool in this condition of adjustnient.

The iorrn of the invention shown in Figures 5, 7 and 8 is like in mostrespects to that shown in the preceding igures, but with the followingdifferences. The serrations 5a on the part la, which correspond to theserrations 5 on the part i, do not extend in an inward radial directionentirely therefrom to the opening for the stud 22, but are out away topermit a ooss 2b on the plate 2a, to extend into the opening thusprovided.

Also the driving wheel 9a, which corresponds to the wheel 8, does nothave a bearing on the bolt or stud, but is mounted to rotate upon aslightly tapered boss lila. on the exterior face of said plate 2a, thehole it in said Wheel being tapered to correspond with the tapering ofthe cess ita. The boss is somewhat longer in an axial direction than thethickness of the wheel so that, when the stud is tightened, the wheel Samay freely rotate.

The plates la and 2a may be clamped together and the wheel da held inposition by an ordinary bolt Eil shown in Figure 6, adapted to receive aWasher and wing nut. However, the structure of Figure 5 provides for asteadying knob 2l. This knob conveniently be mounted on the end of thestud 22 which projects beyond the outer face of the plate la and isthreaded to receive said knob as shown at That portion of the stud 22which projects beyond Jfhe other face of the plate la is adapted to passthrough the central opening in the bosses 2b and lila and is threaded toreceive a wing nut 2li to clamp a washer against the outer end of theboss lila to hold the driving gear 9a in position and all or the partsassembled and clamped together with the serrations in the adjacent facesof the plates in intertting relation. To preclude inadvertent rotationof the stud 22, it may have one or more flat sides 23 interiitting witha correspondingly shaped recess in the plate la.

The driving wheel .Cia of Figure is preferably provided with an annularrib 2 on its inner lace, so that, after long periods of use, when theparts may become worn, or in the event that the stud is not clampedtightly before using the hand drill, the annular rib may contact withthe outer race of the plate 2a. This engagement will keep the wheel fromwobbling as it is rotated and insure proper mesh between the teeth ofthe driving wheel and the pinion on the chuck spindle.

l will he noted that the structures of Figures l 2 also embodies anannular rib 2l adapted o function in like manner.

T e tools which I have described have many advantages over adjustablehand drills hereto- :ore used. Practically all parts are made by castingand the tolerances need not be very close. There is a minimum of boring,tting or inishing necessary, My tools, therefore, adapt themselves verywell to quantity production and are nevertheless good tools. 'When therelatively adjustable plates i and 2 or la and 2a are clamped together,their contacting surfaces engage one another across a broad expanse andthus have a very tight positive grip with one another so that there isno chance of slipping and injuring the hands of the operator or rnarringthe work operated upon. This is in. marked contrast with the springactuated devices, pins, and other expedients heretofore employed intools of this general character.

The foregoing detailed description sets forth the invention in itspreferred practical form, but the invention is to he understood as fullycoininensurate with the appended claims.

laving thus iully described the invention, what i claim as new anddesire to secure by Letters Patent is;

l. A hand drill comprising a chuck plate and a handle plate arranged inface contacting relation and having alined openings therethrough withthe contacting faces of the plates complenientarily serrated radially ofsaid openings for interfitting relation, a handle plate provided at itsexterior face with a circular boss coaxial of its opening and forming abearing for a driving gear, a driving bevel gear journalled for rotationon bearing, a stud extending through the openings in said plates, a nutscrewed onto said stud beyond. the end of the boss on the handle platete normally maintain the serrations of the two lates in interittingrelation and simultaneously cld the driving gear on said boss, a chuckspinvlo journalled in the chuck plate for rotation on axis perpendicularto the axis of the stud the handle plate and an offset operating carriedby the driving gear, said driving A hand drill comprising a chuck plateand a handle plate bolted together in -iace contacting relation by aclamping stud, the contiguous faces oi said plates seingcoinplernentarily serrated radially cf the axis of said stud forintertting relation to lock the plates against relative rotation so longas they are tightly clamped together by the stud, a chuck spindlecarried by the chuck plate and journalled or rotation therein on an axisperpendicular and radial tov the axis of the stud, a chuck and a bevelpinion on the chuck spindle, a driving bevel gear meshing with thepinion and journalled for rotation on the stud, a shank extending fromthe handle plate, and a handle on said shank, said driving gear beingprovided on its inner face with an annular rib adapted to contact withthe adjacent face of the handle plate to steady the operations of thegear when driving the pinion.

SAUL SHALER.

REFERENCES CYTED r`fhe following references are of record in the rilethis patent:

UNITED STATES PATENTS Number Nance Date 661,418 McClellan Nov. 6, 1900684,722 Rose Oct. 15, 1901 809,822 Lawton Jan. 9, 1906 1,343,189 MaddoxJune 8, 1920 2,310,759 Clawson Feb. 9, 1943 2,340,707 Staley Feb. l,1944

